Archipelago » qemu

/*

 * QEMU AMD PC-Net II (Am79C970A) emulation

 *

 * Copyright (c) 2004 Antony T Curtis

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

/* This software was written to be compatible with the specification:

 * AMD Am79C970A PCnet-PCI II Ethernet Controller Data-Sheet

 * AMD Publication# 19436  Rev:E  Amendment/0  Issue Date: June 2000

 */

/*

 * On Sparc32, this is the Lance (Am7990) part of chip STP2000 (Master I/O), also

 * produced as NCR89C100. See

 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt

 * and

 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR92C990.txt

 */

#include "qdev.h"

#include "net/net.h"

#include "qemu/timer.h"

#include "qemu/sockets.h"

#include "sysemu/sysemu.h"

#include "pcnet.h"

//#define PCNET_DEBUG

//#define PCNET_DEBUG_IO

//#define PCNET_DEBUG_BCR

//#define PCNET_DEBUG_CSR

//#define PCNET_DEBUG_RMD

//#define PCNET_DEBUG_TMD

//#define PCNET_DEBUG_MATCH

struct qemu_ether_header {

    uint8_t ether_dhost[6];

    uint8_t ether_shost[6];

    uint16_t ether_type;

};

#define CSR_INIT(S)      !!(((S)->csr[0])&0x0001)

#define CSR_STRT(S)      !!(((S)->csr[0])&0x0002)

#define CSR_STOP(S)      !!(((S)->csr[0])&0x0004)

#define CSR_TDMD(S)      !!(((S)->csr[0])&0x0008)

#define CSR_TXON(S)      !!(((S)->csr[0])&0x0010)

#define CSR_RXON(S)      !!(((S)->csr[0])&0x0020)

#define CSR_INEA(S)      !!(((S)->csr[0])&0x0040)

#define CSR_BSWP(S)      !!(((S)->csr[3])&0x0004)

#define CSR_LAPPEN(S)    !!(((S)->csr[3])&0x0020)

#define CSR_DXSUFLO(S)   !!(((S)->csr[3])&0x0040)

#define CSR_ASTRP_RCV(S) !!(((S)->csr[4])&0x0800)

#define CSR_DPOLL(S)     !!(((S)->csr[4])&0x1000)

#define CSR_SPND(S)      !!(((S)->csr[5])&0x0001)

#define CSR_LTINTEN(S)   !!(((S)->csr[5])&0x4000)

#define CSR_TOKINTD(S)   !!(((S)->csr[5])&0x8000)

#define CSR_DRX(S)       !!(((S)->csr[15])&0x0001)

#define CSR_DTX(S)       !!(((S)->csr[15])&0x0002)

#define CSR_LOOP(S)      !!(((S)->csr[15])&0x0004)

#define CSR_DXMTFCS(S)   !!(((S)->csr[15])&0x0008)

#define CSR_INTL(S)      !!(((S)->csr[15])&0x0040)

#define CSR_DRCVPA(S)    !!(((S)->csr[15])&0x2000)

#define CSR_DRCVBC(S)    !!(((S)->csr[15])&0x4000)

#define CSR_PROM(S)      !!(((S)->csr[15])&0x8000)

#define CSR_CRBC(S)      ((S)->csr[40])

#define CSR_CRST(S)      ((S)->csr[41])

#define CSR_CXBC(S)      ((S)->csr[42])

#define CSR_CXST(S)      ((S)->csr[43])

#define CSR_NRBC(S)      ((S)->csr[44])

#define CSR_NRST(S)      ((S)->csr[45])

#define CSR_POLL(S)      ((S)->csr[46])

#define CSR_PINT(S)      ((S)->csr[47])

#define CSR_RCVRC(S)     ((S)->csr[72])

#define CSR_XMTRC(S)     ((S)->csr[74])

#define CSR_RCVRL(S)     ((S)->csr[76])

#define CSR_XMTRL(S)     ((S)->csr[78])

#define CSR_MISSC(S)     ((S)->csr[112])

#define CSR_IADR(S)      ((S)->csr[ 1] | ((uint32_t)(S)->csr[ 2] << 16))

#define CSR_CRBA(S)      ((S)->csr[18] | ((uint32_t)(S)->csr[19] << 16))

#define CSR_CXBA(S)      ((S)->csr[20] | ((uint32_t)(S)->csr[21] << 16))

#define CSR_NRBA(S)      ((S)->csr[22] | ((uint32_t)(S)->csr[23] << 16))

#define CSR_BADR(S)      ((S)->csr[24] | ((uint32_t)(S)->csr[25] << 16))

#define CSR_NRDA(S)      ((S)->csr[26] | ((uint32_t)(S)->csr[27] << 16))

#define CSR_CRDA(S)      ((S)->csr[28] | ((uint32_t)(S)->csr[29] << 16))

#define CSR_BADX(S)      ((S)->csr[30] | ((uint32_t)(S)->csr[31] << 16))

#define CSR_NXDA(S)      ((S)->csr[32] | ((uint32_t)(S)->csr[33] << 16))

#define CSR_CXDA(S)      ((S)->csr[34] | ((uint32_t)(S)->csr[35] << 16))

#define CSR_NNRD(S)      ((S)->csr[36] | ((uint32_t)(S)->csr[37] << 16))

#define CSR_NNXD(S)      ((S)->csr[38] | ((uint32_t)(S)->csr[39] << 16))

#define CSR_PXDA(S)      ((S)->csr[60] | ((uint32_t)(S)->csr[61] << 16))

#define CSR_NXBA(S)      ((S)->csr[64] | ((uint32_t)(S)->csr[65] << 16))

#define PHYSADDR(S,A) \

  (BCR_SSIZE32(S) ? (A) : (A) | ((0xff00 & (uint32_t)(S)->csr[2])<<16))

struct pcnet_initblk16 {

    uint16_t mode;

    uint16_t padr[3];

    uint16_t ladrf[4];

    uint32_t rdra;

    uint32_t tdra;

};

struct pcnet_initblk32 {

    uint16_t mode;

    uint8_t rlen;

    uint8_t tlen;

    uint16_t padr[3];

    uint16_t _res;

    uint16_t ladrf[4];

    uint32_t rdra;

    uint32_t tdra;

};

struct pcnet_TMD {

    uint32_t tbadr;

    int16_t length;

    int16_t status;

    uint32_t misc;

    uint32_t res;

};

#define TMDL_BCNT_MASK  0x0fff

#define TMDL_BCNT_SH    0

#define TMDL_ONES_MASK  0xf000

#define TMDL_ONES_SH    12

#define TMDS_BPE_MASK   0x0080

#define TMDS_BPE_SH     7

#define TMDS_ENP_MASK   0x0100

#define TMDS_ENP_SH     8

#define TMDS_STP_MASK   0x0200

#define TMDS_STP_SH     9

#define TMDS_DEF_MASK   0x0400

#define TMDS_DEF_SH     10

#define TMDS_ONE_MASK   0x0800

#define TMDS_ONE_SH     11

#define TMDS_LTINT_MASK 0x1000

#define TMDS_LTINT_SH   12

#define TMDS_NOFCS_MASK 0x2000

#define TMDS_NOFCS_SH   13

#define TMDS_ADDFCS_MASK TMDS_NOFCS_MASK

#define TMDS_ADDFCS_SH  TMDS_NOFCS_SH

#define TMDS_ERR_MASK   0x4000

#define TMDS_ERR_SH     14

#define TMDS_OWN_MASK   0x8000

#define TMDS_OWN_SH     15

#define TMDM_TRC_MASK   0x0000000f

#define TMDM_TRC_SH     0

#define TMDM_TDR_MASK   0x03ff0000

#define TMDM_TDR_SH     16

#define TMDM_RTRY_MASK  0x04000000

#define TMDM_RTRY_SH    26

#define TMDM_LCAR_MASK  0x08000000

#define TMDM_LCAR_SH    27

#define TMDM_LCOL_MASK  0x10000000

#define TMDM_LCOL_SH    28

#define TMDM_EXDEF_MASK 0x20000000

#define TMDM_EXDEF_SH   29

#define TMDM_UFLO_MASK  0x40000000

#define TMDM_UFLO_SH    30

#define TMDM_BUFF_MASK  0x80000000

#define TMDM_BUFF_SH    31

struct pcnet_RMD {

    uint32_t rbadr;

    int16_t buf_length;

    int16_t status;

    uint32_t msg_length;

    uint32_t res;

};

#define RMDL_BCNT_MASK  0x0fff

#define RMDL_BCNT_SH    0

#define RMDL_ONES_MASK  0xf000

#define RMDL_ONES_SH    12

#define RMDS_BAM_MASK   0x0010

#define RMDS_BAM_SH     4

#define RMDS_LFAM_MASK  0x0020

#define RMDS_LFAM_SH    5

#define RMDS_PAM_MASK   0x0040

#define RMDS_PAM_SH     6

#define RMDS_BPE_MASK   0x0080

#define RMDS_BPE_SH     7

#define RMDS_ENP_MASK   0x0100

#define RMDS_ENP_SH     8

#define RMDS_STP_MASK   0x0200

#define RMDS_STP_SH     9

#define RMDS_BUFF_MASK  0x0400

#define RMDS_BUFF_SH    10

#define RMDS_CRC_MASK   0x0800

#define RMDS_CRC_SH     11

#define RMDS_OFLO_MASK  0x1000

#define RMDS_OFLO_SH    12

#define RMDS_FRAM_MASK  0x2000

#define RMDS_FRAM_SH    13

#define RMDS_ERR_MASK   0x4000

#define RMDS_ERR_SH     14

#define RMDS_OWN_MASK   0x8000

#define RMDS_OWN_SH     15

#define RMDM_MCNT_MASK  0x00000fff

#define RMDM_MCNT_SH    0

#define RMDM_ZEROS_MASK 0x0000f000

#define RMDM_ZEROS_SH   12

#define RMDM_RPC_MASK   0x00ff0000

#define RMDM_RPC_SH     16

#define RMDM_RCC_MASK   0xff000000

#define RMDM_RCC_SH     24

#define SET_FIELD(regp, name, field, value)             \

  (*(regp) = (*(regp) & ~(name ## _ ## field ## _MASK)) \

             | ((value) << name ## _ ## field ## _SH))

#define GET_FIELD(reg, name, field)                     \

  (((reg) & name ## _ ## field ## _MASK) >> name ## _ ## field ## _SH)

#define PRINT_TMD(T) printf(                            \

        "TMD0 : TBADR=0x%08x\n"                         \

        "TMD1 : OWN=%d, ERR=%d, FCS=%d, LTI=%d, "       \

        "ONE=%d, DEF=%d, STP=%d, ENP=%d,\n"             \

        "       BPE=%d, BCNT=%d\n"                      \

        "TMD2 : BUF=%d, UFL=%d, EXD=%d, LCO=%d, "       \

        "LCA=%d, RTR=%d,\n"                             \

        "       TDR=%d, TRC=%d\n",                      \

        (T)->tbadr,                                     \

        GET_FIELD((T)->status, TMDS, OWN),              \

        GET_FIELD((T)->status, TMDS, ERR),              \

        GET_FIELD((T)->status, TMDS, NOFCS),            \

        GET_FIELD((T)->status, TMDS, LTINT),            \

        GET_FIELD((T)->status, TMDS, ONE),              \

        GET_FIELD((T)->status, TMDS, DEF),              \

        GET_FIELD((T)->status, TMDS, STP),              \

        GET_FIELD((T)->status, TMDS, ENP),              \

        GET_FIELD((T)->status, TMDS, BPE),              \

        4096-GET_FIELD((T)->length, TMDL, BCNT),        \

        GET_FIELD((T)->misc, TMDM, BUFF),               \

        GET_FIELD((T)->misc, TMDM, UFLO),               \

        GET_FIELD((T)->misc, TMDM, EXDEF),              \

        GET_FIELD((T)->misc, TMDM, LCOL),               \

        GET_FIELD((T)->misc, TMDM, LCAR),               \

        GET_FIELD((T)->misc, TMDM, RTRY),               \

        GET_FIELD((T)->misc, TMDM, TDR),                \

        GET_FIELD((T)->misc, TMDM, TRC))

#define PRINT_RMD(R) printf(                            \

        "RMD0 : RBADR=0x%08x\n"                         \

        "RMD1 : OWN=%d, ERR=%d, FRAM=%d, OFLO=%d, "     \

        "CRC=%d, BUFF=%d, STP=%d, ENP=%d,\n       "     \

        "BPE=%d, PAM=%d, LAFM=%d, BAM=%d, ONES=%d, BCNT=%d\n" \

        "RMD2 : RCC=%d, RPC=%d, MCNT=%d, ZEROS=%d\n",   \

        (R)->rbadr,                                     \

        GET_FIELD((R)->status, RMDS, OWN),              \

        GET_FIELD((R)->status, RMDS, ERR),              \

        GET_FIELD((R)->status, RMDS, FRAM),             \

        GET_FIELD((R)->status, RMDS, OFLO),             \

        GET_FIELD((R)->status, RMDS, CRC),              \

        GET_FIELD((R)->status, RMDS, BUFF),             \

        GET_FIELD((R)->status, RMDS, STP),              \

        GET_FIELD((R)->status, RMDS, ENP),              \

        GET_FIELD((R)->status, RMDS, BPE),              \

        GET_FIELD((R)->status, RMDS, PAM),              \

        GET_FIELD((R)->status, RMDS, LFAM),             \

        GET_FIELD((R)->status, RMDS, BAM),              \

        GET_FIELD((R)->buf_length, RMDL, ONES),         \

        4096-GET_FIELD((R)->buf_length, RMDL, BCNT),    \

        GET_FIELD((R)->msg_length, RMDM, RCC),          \

        GET_FIELD((R)->msg_length, RMDM, RPC),          \

        GET_FIELD((R)->msg_length, RMDM, MCNT),         \

        GET_FIELD((R)->msg_length, RMDM, ZEROS))

static inline void pcnet_tmd_load(PCNetState *s, struct pcnet_TMD *tmd,

                                  hwaddr addr)

{

    if (!BCR_SSIZE32(s)) {

        struct {

            uint32_t tbadr;

            int16_t length;

            int16_t status;

        } xda;

        s->phys_mem_read(s->dma_opaque, addr, (void *)&xda, sizeof(xda), 0);

        tmd->tbadr = le32_to_cpu(xda.tbadr) & 0xffffff;

        tmd->length = le16_to_cpu(xda.length);

        tmd->status = (le32_to_cpu(xda.tbadr) >> 16) & 0xff00;

        tmd->misc = le16_to_cpu(xda.status) << 16;

        tmd->res = 0;

    } else {

        s->phys_mem_read(s->dma_opaque, addr, (void *)tmd, sizeof(*tmd), 0);

        le32_to_cpus(&tmd->tbadr);

        le16_to_cpus((uint16_t *)&tmd->length);

        le16_to_cpus((uint16_t *)&tmd->status);

        le32_to_cpus(&tmd->misc);

        le32_to_cpus(&tmd->res);

        if (BCR_SWSTYLE(s) == 3) {

            uint32_t tmp = tmd->tbadr;

            tmd->tbadr = tmd->misc;

            tmd->misc = tmp;

        }

    }

}

static inline void pcnet_tmd_store(PCNetState *s, const struct pcnet_TMD *tmd,

                                   hwaddr addr)

{

    if (!BCR_SSIZE32(s)) {

        struct {

            uint32_t tbadr;

            int16_t length;

            int16_t status;

        } xda;

        xda.tbadr = cpu_to_le32((tmd->tbadr & 0xffffff) |

                                ((tmd->status & 0xff00) << 16));

        xda.length = cpu_to_le16(tmd->length);

        xda.status = cpu_to_le16(tmd->misc >> 16);

        s->phys_mem_write(s->dma_opaque, addr, (void *)&xda, sizeof(xda), 0);

    } else {

        struct {

            uint32_t tbadr;

            int16_t length;

            int16_t status;

            uint32_t misc;

            uint32_t res;

        } xda;

        xda.tbadr = cpu_to_le32(tmd->tbadr);

        xda.length = cpu_to_le16(tmd->length);

        xda.status = cpu_to_le16(tmd->status);

        xda.misc = cpu_to_le32(tmd->misc);

        xda.res = cpu_to_le32(tmd->res);

        if (BCR_SWSTYLE(s) == 3) {

            uint32_t tmp = xda.tbadr;

            xda.tbadr = xda.misc;

            xda.misc = tmp;

        }

        s->phys_mem_write(s->dma_opaque, addr, (void *)&xda, sizeof(xda), 0);

    }

}

static inline void pcnet_rmd_load(PCNetState *s, struct pcnet_RMD *rmd,

                                  hwaddr addr)

{

    if (!BCR_SSIZE32(s)) {

        struct {

            uint32_t rbadr;

            int16_t buf_length;

            int16_t msg_length;

        } rda;

        s->phys_mem_read(s->dma_opaque, addr, (void *)&rda, sizeof(rda), 0);

        rmd->rbadr = le32_to_cpu(rda.rbadr) & 0xffffff;

        rmd->buf_length = le16_to_cpu(rda.buf_length);

        rmd->status = (le32_to_cpu(rda.rbadr) >> 16) & 0xff00;

        rmd->msg_length = le16_to_cpu(rda.msg_length);

        rmd->res = 0;

    } else {

        s->phys_mem_read(s->dma_opaque, addr, (void *)rmd, sizeof(*rmd), 0);

        le32_to_cpus(&rmd->rbadr);

        le16_to_cpus((uint16_t *)&rmd->buf_length);

        le16_to_cpus((uint16_t *)&rmd->status);

        le32_to_cpus(&rmd->msg_length);

        le32_to_cpus(&rmd->res);

        if (BCR_SWSTYLE(s) == 3) {

            uint32_t tmp = rmd->rbadr;

            rmd->rbadr = rmd->msg_length;

            rmd->msg_length = tmp;

        }

    }

}

static inline void pcnet_rmd_store(PCNetState *s, struct pcnet_RMD *rmd,

                                   hwaddr addr)

{

    if (!BCR_SSIZE32(s)) {

        struct {

            uint32_t rbadr;

            int16_t buf_length;

            int16_t msg_length;

        } rda;

        rda.rbadr = cpu_to_le32((rmd->rbadr & 0xffffff) |

                                ((rmd->status & 0xff00) << 16));

        rda.buf_length = cpu_to_le16(rmd->buf_length);

        rda.msg_length = cpu_to_le16(rmd->msg_length);

        s->phys_mem_write(s->dma_opaque, addr, (void *)&rda, sizeof(rda), 0);

    } else {

        struct {

            uint32_t rbadr;

            int16_t buf_length;

            int16_t status;

            uint32_t msg_length;

            uint32_t res;

        } rda;

        rda.rbadr = cpu_to_le32(rmd->rbadr);

        rda.buf_length = cpu_to_le16(rmd->buf_length);

        rda.status = cpu_to_le16(rmd->status);

        rda.msg_length = cpu_to_le32(rmd->msg_length);

        rda.res = cpu_to_le32(rmd->res);

        if (BCR_SWSTYLE(s) == 3) {

            uint32_t tmp = rda.rbadr;

            rda.rbadr = rda.msg_length;

            rda.msg_length = tmp;

        }

        s->phys_mem_write(s->dma_opaque, addr, (void *)&rda, sizeof(rda), 0);

    }

}

#define TMDLOAD(TMD,ADDR) pcnet_tmd_load(s,TMD,ADDR)

#define TMDSTORE(TMD,ADDR) pcnet_tmd_store(s,TMD,ADDR)

#define RMDLOAD(RMD,ADDR) pcnet_rmd_load(s,RMD,ADDR)

#define RMDSTORE(RMD,ADDR) pcnet_rmd_store(s,RMD,ADDR)

#if 1

#define CHECK_RMD(ADDR,RES) do {                \

    struct pcnet_RMD rmd;                       \

    RMDLOAD(&rmd,(ADDR));                       \

    (RES) |= (GET_FIELD(rmd.buf_length, RMDL, ONES) != 15) \

          || (GET_FIELD(rmd.msg_length, RMDM, ZEROS) != 0); \

} while (0)

#define CHECK_TMD(ADDR,RES) do {                \

    struct pcnet_TMD tmd;                       \

    TMDLOAD(&tmd,(ADDR));                       \

    (RES) |= (GET_FIELD(tmd.length, TMDL, ONES) != 15); \

} while (0)

#else

#define CHECK_RMD(ADDR,RES) do {                \

    switch (BCR_SWSTYLE(s)) {                   \

    case 0x00:                                  \

        do {                                    \

            uint16_t rda[4];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR), \

                (void *)&rda[0], sizeof(rda), 0); \

            (RES) |= (rda[2] & 0xf000)!=0xf000; \

            (RES) |= (rda[3] & 0xf000)!=0x0000; \

        } while (0);                            \

        break;                                  \

    case 0x01:                                  \

    case 0x02:                                  \

        do {                                    \

            uint32_t rda[4];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR), \

                (void *)&rda[0], sizeof(rda), 0); \

            (RES) |= (rda[1] & 0x0000f000L)!=0x0000f000L; \

            (RES) |= (rda[2] & 0x0000f000L)!=0x00000000L; \

        } while (0);                            \

        break;                                  \

    case 0x03:                                  \

        do {                                    \

            uint32_t rda[4];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR), \

                (void *)&rda[0], sizeof(rda), 0); \

            (RES) |= (rda[0] & 0x0000f000L)!=0x00000000L; \

            (RES) |= (rda[1] & 0x0000f000L)!=0x0000f000L; \

        } while (0);                            \

        break;                                  \

    }                                           \

} while (0)

#define CHECK_TMD(ADDR,RES) do {                \

    switch (BCR_SWSTYLE(s)) {                   \

    case 0x00:                                  \

        do {                                    \

            uint16_t xda[4];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR), \

                (void *)&xda[0], sizeof(xda), 0); \

            (RES) |= (xda[2] & 0xf000)!=0xf000; \

        } while (0);                            \

        break;                                  \

    case 0x01:                                  \

    case 0x02:                                  \

    case 0x03:                                  \

        do {                                    \

            uint32_t xda[4];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR), \

                (void *)&xda[0], sizeof(xda), 0); \

            (RES) |= (xda[1] & 0x0000f000L)!=0x0000f000L; \

        } while (0);                            \

        break;                                  \

    }                                           \

} while (0)

#endif

#define PRINT_PKTHDR(BUF) do {                  \

    struct qemu_ether_header *hdr = (void *)(BUF); \

    printf("packet dhost=%02x:%02x:%02x:%02x:%02x:%02x, " \

           "shost=%02x:%02x:%02x:%02x:%02x:%02x, " \

           "type=0x%04x\n",                     \

           hdr->ether_dhost[0],hdr->ether_dhost[1],hdr->ether_dhost[2], \

           hdr->ether_dhost[3],hdr->ether_dhost[4],hdr->ether_dhost[5], \

           hdr->ether_shost[0],hdr->ether_shost[1],hdr->ether_shost[2], \

           hdr->ether_shost[3],hdr->ether_shost[4],hdr->ether_shost[5], \

           be16_to_cpu(hdr->ether_type));       \

} while (0)

#define MULTICAST_FILTER_LEN 8

static inline uint32_t lnc_mchash(const uint8_t *ether_addr)

{

#define LNC_POLYNOMIAL          0xEDB88320UL

    uint32_t crc = 0xFFFFFFFF;

    int idx, bit;

    uint8_t data;

    for (idx = 0; idx < 6; idx++) {

        for (data = *ether_addr++, bit = 0; bit < MULTICAST_FILTER_LEN; bit++) {

            crc = (crc >> 1) ^ (((crc ^ data) & 1) ? LNC_POLYNOMIAL : 0);

            data >>= 1;

        }

    }

    return crc;

#undef LNC_POLYNOMIAL

}

#define CRC(crc, ch)         (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])

/* generated using the AUTODIN II polynomial

 *        x^32 + x^26 + x^23 + x^22 + x^16 +

 *        x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1

 */

static const uint32_t crctab[256] = {

        0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,

        0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,

        0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,

        0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,

        0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,

        0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,

        0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,

        0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,

        0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,

        0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,

        0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,

        0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,

        0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,

        0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,

        0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,

        0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,

        0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,

        0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,

        0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,

        0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,

        0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,

        0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,

        0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,

        0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,

        0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,

        0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,

        0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,

        0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,

        0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,

        0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,

        0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,

        0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,

        0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,

        0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,

        0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,

        0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,

        0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,

        0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,

        0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,

        0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,

        0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,

        0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,

        0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,

        0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,

        0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,

        0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,

        0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,

        0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,

        0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,

        0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,

        0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,

        0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,

        0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,

        0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,

        0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,

        0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,

        0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,

        0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,

        0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,

        0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,

        0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,

        0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,

        0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,

        0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,

};

static inline int padr_match(PCNetState *s, const uint8_t *buf, int size)

{

    struct qemu_ether_header *hdr = (void *)buf;

    uint8_t padr[6] = {

        s->csr[12] & 0xff, s->csr[12] >> 8,

        s->csr[13] & 0xff, s->csr[13] >> 8,

        s->csr[14] & 0xff, s->csr[14] >> 8

    };

    int result = (!CSR_DRCVPA(s)) && !memcmp(hdr->ether_dhost, padr, 6);

#ifdef PCNET_DEBUG_MATCH

    printf("packet dhost=%02x:%02x:%02x:%02x:%02x:%02x, "

           "padr=%02x:%02x:%02x:%02x:%02x:%02x\n",

           hdr->ether_dhost[0],hdr->ether_dhost[1],hdr->ether_dhost[2],

           hdr->ether_dhost[3],hdr->ether_dhost[4],hdr->ether_dhost[5],

           padr[0],padr[1],padr[2],padr[3],padr[4],padr[5]);

    printf("padr_match result=%d\n", result);

#endif

    return result;

}

static inline int padr_bcast(PCNetState *s, const uint8_t *buf, int size)

{

    static const uint8_t BCAST[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

    struct qemu_ether_header *hdr = (void *)buf;

    int result = !CSR_DRCVBC(s) && !memcmp(hdr->ether_dhost, BCAST, 6);

#ifdef PCNET_DEBUG_MATCH

    printf("padr_bcast result=%d\n", result);

#endif

    return result;

}

static inline int ladr_match(PCNetState *s, const uint8_t *buf, int size)

{

    struct qemu_ether_header *hdr = (void *)buf;

    if ((*(hdr->ether_dhost)&0x01) &&

        ((uint64_t *)&s->csr[8])[0] != 0LL) {

        uint8_t ladr[8] = {

            s->csr[8] & 0xff, s->csr[8] >> 8,

            s->csr[9] & 0xff, s->csr[9] >> 8,

            s->csr[10] & 0xff, s->csr[10] >> 8,

            s->csr[11] & 0xff, s->csr[11] >> 8

        };

        int index = lnc_mchash(hdr->ether_dhost) >> 26;

        return !!(ladr[index >> 3] & (1 << (index & 7)));

    }

    return 0;

}

static inline hwaddr pcnet_rdra_addr(PCNetState *s, int idx)

{

    while (idx < 1) idx += CSR_RCVRL(s);

    return s->rdra + ((CSR_RCVRL(s) - idx) * (BCR_SWSTYLE(s) ? 16 : 8));

}

static inline int64_t pcnet_get_next_poll_time(PCNetState *s, int64_t current_time)

{

    int64_t next_time = current_time +

        muldiv64(65536 - (CSR_SPND(s) ? 0 : CSR_POLL(s)),

                 get_ticks_per_sec(), 33000000L);

    if (next_time <= current_time)

        next_time = current_time + 1;

    return next_time;

}

static void pcnet_poll(PCNetState *s);

static void pcnet_poll_timer(void *opaque);

static uint32_t pcnet_csr_readw(PCNetState *s, uint32_t rap);

static void pcnet_csr_writew(PCNetState *s, uint32_t rap, uint32_t new_value);

static void pcnet_bcr_writew(PCNetState *s, uint32_t rap, uint32_t val);

static void pcnet_s_reset(PCNetState *s)

{

#ifdef PCNET_DEBUG

    printf("pcnet_s_reset\n");

#endif

    s->rdra = 0;

    s->tdra = 0;

    s->rap = 0;

    s->bcr[BCR_BSBC] &= ~0x0080;

    s->csr[0]   = 0x0004;

    s->csr[3]   = 0x0000;

    s->csr[4]   = 0x0115;

    s->csr[5]   = 0x0000;

    s->csr[6]   = 0x0000;

    s->csr[8]   = 0;

    s->csr[9]   = 0;

    s->csr[10]  = 0;

    s->csr[11]  = 0;

    s->csr[12]  = le16_to_cpu(((uint16_t *)&s->prom[0])[0]);

    s->csr[13]  = le16_to_cpu(((uint16_t *)&s->prom[0])[1]);

    s->csr[14]  = le16_to_cpu(((uint16_t *)&s->prom[0])[2]);

    s->csr[15] &= 0x21c4;

    s->csr[72]  = 1;

    s->csr[74]  = 1;

    s->csr[76]  = 1;

    s->csr[78]  = 1;

    s->csr[80]  = 0x1410;

    s->csr[88]  = 0x1003;

    s->csr[89]  = 0x0262;

    s->csr[94]  = 0x0000;

    s->csr[100] = 0x0200;

    s->csr[103] = 0x0105;

    s->csr[103] = 0x0105;

    s->csr[112] = 0x0000;

    s->csr[114] = 0x0000;

    s->csr[122] = 0x0000;

    s->csr[124] = 0x0000;

    s->tx_busy = 0;

}

static void pcnet_update_irq(PCNetState *s)

{

    int isr = 0;

    s->csr[0] &= ~0x0080;

#if 1

    if (((s->csr[0] & ~s->csr[3]) & 0x5f00) ||

        (((s->csr[4]>>1) & ~s->csr[4]) & 0x0115) ||

        (((s->csr[5]>>1) & s->csr[5]) & 0x0048))

#else

    if ((!(s->csr[3] & 0x4000) && !!(s->csr[0] & 0x4000)) /* BABL */ ||

        (!(s->csr[3] & 0x1000) && !!(s->csr[0] & 0x1000)) /* MISS */ ||

        (!(s->csr[3] & 0x0100) && !!(s->csr[0] & 0x0100)) /* IDON */ ||

        (!(s->csr[3] & 0x0200) && !!(s->csr[0] & 0x0200)) /* TINT */ ||

        (!(s->csr[3] & 0x0400) && !!(s->csr[0] & 0x0400)) /* RINT */ ||

        (!(s->csr[3] & 0x0800) && !!(s->csr[0] & 0x0800)) /* MERR */ ||

        (!(s->csr[4] & 0x0001) && !!(s->csr[4] & 0x0002)) /* JAB */ ||

        (!(s->csr[4] & 0x0004) && !!(s->csr[4] & 0x0008)) /* TXSTRT */ ||

        (!(s->csr[4] & 0x0010) && !!(s->csr[4] & 0x0020)) /* RCVO */ ||

        (!(s->csr[4] & 0x0100) && !!(s->csr[4] & 0x0200)) /* MFCO */ ||

        (!!(s->csr[5] & 0x0040) && !!(s->csr[5] & 0x0080)) /* EXDINT */ ||

        (!!(s->csr[5] & 0x0008) && !!(s->csr[5] & 0x0010)) /* MPINT */)

#endif

    {

        isr = CSR_INEA(s);

        s->csr[0] |= 0x0080;

    }

    if (!!(s->csr[4] & 0x0080) && CSR_INEA(s)) { /* UINT */

        s->csr[4] &= ~0x0080;

        s->csr[4] |= 0x0040;

        s->csr[0] |= 0x0080;

        isr = 1;

#ifdef PCNET_DEBUG

        printf("pcnet user int\n");

#endif

    }

#if 1

    if (((s->csr[5]>>1) & s->csr[5]) & 0x0500)

#else

    if ((!!(s->csr[5] & 0x0400) && !!(s->csr[5] & 0x0800)) /* SINT */ ||

        (!!(s->csr[5] & 0x0100) && !!(s->csr[5] & 0x0200)) /* SLPINT */ )

#endif

    {

        isr = 1;

        s->csr[0] |= 0x0080;

    }

    if (isr != s->isr) {

#ifdef PCNET_DEBUG

        printf("pcnet: INTA=%d\n", isr);

#endif

    }

    qemu_set_irq(s->irq, isr);

    s->isr = isr;

}

static void pcnet_init(PCNetState *s)

{

    int rlen, tlen;

    uint16_t padr[3], ladrf[4], mode;

    uint32_t rdra, tdra;

#ifdef PCNET_DEBUG

    printf("pcnet_init init_addr=0x%08x\n", PHYSADDR(s,CSR_IADR(s)));

#endif

    if (BCR_SSIZE32(s)) {

        struct pcnet_initblk32 initblk;

        s->phys_mem_read(s->dma_opaque, PHYSADDR(s,CSR_IADR(s)),

                (uint8_t *)&initblk, sizeof(initblk), 0);

        mode = le16_to_cpu(initblk.mode);

        rlen = initblk.rlen >> 4;

        tlen = initblk.tlen >> 4;

        ladrf[0] = le16_to_cpu(initblk.ladrf[0]);

        ladrf[1] = le16_to_cpu(initblk.ladrf[1]);

        ladrf[2] = le16_to_cpu(initblk.ladrf[2]);

        ladrf[3] = le16_to_cpu(initblk.ladrf[3]);

        padr[0] = le16_to_cpu(initblk.padr[0]);

        padr[1] = le16_to_cpu(initblk.padr[1]);

        padr[2] = le16_to_cpu(initblk.padr[2]);

        rdra = le32_to_cpu(initblk.rdra);

        tdra = le32_to_cpu(initblk.tdra);

    } else {

        struct pcnet_initblk16 initblk;

        s->phys_mem_read(s->dma_opaque, PHYSADDR(s,CSR_IADR(s)),

                (uint8_t *)&initblk, sizeof(initblk), 0);

        mode = le16_to_cpu(initblk.mode);

        ladrf[0] = le16_to_cpu(initblk.ladrf[0]);

        ladrf[1] = le16_to_cpu(initblk.ladrf[1]);